Dicalcium silicate

CAS 10034-77-2

U.S. production volumes are classified as confidential business information.

Molecular structure of 10034-77-2 — 2 Ca²⁺

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$21M

Top sourceMexico 25%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 283990 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 283990, which covers 20 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

MX 25%MexicoCA 17%CanadaDE 12%GermanyIT 12%ItalyJP 9%Japan

Malaysia
Denmark
Turkey
Switzerland
Poland
Hong Kong
Czech Republic
Finland
Australia
Spain
Austria

EPA-registered manufacturers (42)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Cementir Holding N V · IT Italy

Cementos Argos S A · CO Colombia

Crh Plc · IE Ireland

Gcc S A B De C V · MX Mexico

Heidelberg Materials Ag · DE Germany

Show all 42

Taiheiyo Cement · JP Japan

Unacem Corp S A A · PE Peru

Alamo Cement

Argos Newberry Cement Plant

Argos Usa

Ash Grove Cement

Calportland

Capitol Aggregates

Cemex

Cemex Construction Materials Atlantic

Cemex Construction Materials Florida

Cemex Construction Materials South

Crh Americas

Drake Cement

Eagle Materials

Fortaleza Usa

Gcc Dacotah

Gcc Of America

Gcc Rio Grande

Heidelberg Materials Us

Heidelberg Materials Us Cement

Holcim (Us)

Holcim Participation (Us)

Holcim Participations (Us)

Lehigh White Cement

Martin Marietta Marietta

Martin Marietta Materials

Mitsubishi Cement

Monarch Cement

Mountain Cement

National Cement Of California

Nevada Cement

Phoenix Cement

Rc Lonestar

St Marys Cement

Summit Materials

Tehachapi Cement

Domestic parents -- activity not disclosed (2)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Colas

Titan America

EPA-registered importers (8)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Crh Plc · IE Ireland

Crp Plc · IE Ireland

Heidelberg Materials Ag · DE Germany

Taiheiyo Cement · JP Japan

Ash Grove

Show all 8

Heidelberg Materials, Us Cement Llc.

Houston Cement

St. Marys Cement U.S

Why It Matters

Sectors

EnergyConstruction

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 3 sectors as 5 functional roles.

•Binder in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (100%)Processing—incorporation into formulation, mixture, or reaction product
•Adhesion/cohesion promoter in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (21%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (100%)Processing—incorporation into formulation, mixture, or reaction product
•Flux agent in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (100%)Processing—incorporation into formulation, mixture, or reaction product
•Sealant (barrier) in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (100%)Processing—incorporation into formulation, mixture, or reaction product
•Binder in Oil and Gas Drilling, Extraction, and Support activities (10%)Processing—incorporation into formulation, mixture, or reaction product
•Adhesion/cohesion promoter in Construction (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS10034-77-2

PubChem CID14941

DTXSIDDTXSID5049570

FormulaCa2O4Si

Mol. Weight172.24 g/mol

SMILES[O-][Si]([O-])([O-])[O-].[Ca+2].[Ca+2]

Data Sources

EPA CompTox (DSSTox) · DTXSID5049570Retrieved 2026-04-06
PubChem · compound 14941Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Dicalcium silicate (CAS 10034-77-2) https://chemicalindependence.com/chemical/10034-77-2/ EPA CompTox (DSSTox): DTXSID5049570. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5049570 PubChem: 14941. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/14941 EPA Chemical Data Reporting: 10034-77-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 10034-77-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283990 for CAS 10034-77-2. Reporting year: 2024. https://usatrade.census.gov/